Our results show that BMPEA, MPPA, and DMPPA are biologically active. Radioligand binding at various G protein–coupled receptors did not identify nontransporter sites of action that could account for cardiovascular effects of BMPEA or its analogs. The hypertensive effect of BMPEA was reversed by the α-adrenergic antagonist prazosin but not the ganglionic blocker chlorisondamine. BMPEA, MPPA, and DMPPA produced increases in BP that were similar to the effects of amphetamine, but the compounds failed to substantially affect HR or activity. Amphetamine produced significant dose-related increases in blood pressure (BP), heart rate (HR), and locomotor activity in conscious rats fitted with surgically implanted biotelemetry transmitters. Importantly, the releasing actions of BMPEA and MPPA were more potent at NETs than DATs. BMPEA and MPPA were also substrates at DATs and NETs, but they were at least 10-fold less potent than amphetamine.
As expected, amphetamine and methamphetamine were potent substrate-type releasing agents at dopamine transporters (DATs) and norepinephrine transporters (NETs) in rat brain synaptosomes. Here, the neurochemical and cardiovascular effects of BMPEA and its analogs, N-methyl-2-phenylpropan-1-amine (MPPA) and N, N-dimethyl-2-phenylpropan-1-amine (DMPPA), were compared with structurally related amphetamines. Β-Methylphenethylamine is a structural isomer of amphetamine (1-phenylpropan-2-amine) that has been identified in preworkout and weight loss supplements, yet little information is available about its pharmacology.
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